[PATCH 4.9 24/63] net: hns: Free irq when exit from abnormal branch

From: Greg Kroah-Hartman
Date: Fri Jan 11 2019 - 09:29:51 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

[ Upstream commit c82bd077e1ba3dd586569c733dc6d3dd4b0e43cd ]

1.In "hns_nic_init_irq", if request irq fail at index i,
the function return directly without releasing irq resources
that already requested.

2.In "hns_nic_net_up" after "hns_nic_init_irq",
if exceptional branch occurs, irqs that already requested
are not release.

Signed-off-by: Yonglong Liu <liuyonglong@xxxxxxxxxx>
Signed-off-by: Peng Li <lipeng321@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/hisilicon/hns/hns_enet.c | 23 ++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index d96a64bc1db8..63a14edd6a19 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -1195,6 +1195,22 @@ static void hns_set_irq_affinity(struct hns_nic_priv *priv)
}
}

+static void hns_nic_free_irq(int q_num, struct hns_nic_priv *priv)
+{
+ int i;
+
+ for (i = 0; i < q_num * 2; i++) {
+ if (priv->ring_data[i].ring->irq_init_flag == RCB_IRQ_INITED) {
+ irq_set_affinity_hint(priv->ring_data[i].ring->irq,
+ NULL);
+ free_irq(priv->ring_data[i].ring->irq,
+ &priv->ring_data[i]);
+ priv->ring_data[i].ring->irq_init_flag =
+ RCB_IRQ_NOT_INITED;
+ }
+ }
+}
+
static int hns_nic_init_irq(struct hns_nic_priv *priv)
{
struct hnae_handle *h = priv->ae_handle;
@@ -1219,7 +1235,7 @@ static int hns_nic_init_irq(struct hns_nic_priv *priv)
if (ret) {
netdev_err(priv->netdev, "request irq(%d) fail\n",
rd->ring->irq);
- return ret;
+ goto out_free_irq;
}
disable_irq(rd->ring->irq);
rd->ring->irq_init_flag = RCB_IRQ_INITED;
@@ -1229,6 +1245,10 @@ static int hns_nic_init_irq(struct hns_nic_priv *priv)
hns_set_irq_affinity(priv);

return 0;
+
+out_free_irq:
+ hns_nic_free_irq(h->q_num, priv);
+ return ret;
}

static int hns_nic_net_up(struct net_device *ndev)
@@ -1276,6 +1296,7 @@ static int hns_nic_net_up(struct net_device *ndev)
for (j = i - 1; j >= 0; j--)
hns_nic_ring_close(ndev, j);

+ hns_nic_free_irq(h->q_num, priv);
set_bit(NIC_STATE_DOWN, &priv->state);

return ret;
--
2.19.1